CN100450244C

CN100450244C - Method for testing virtual access of random access channel in WCDMA system

Info

Publication number: CN100450244C
Application number: CNB2004101024832A
Authority: CN
Inventors: 苏启太
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2004-12-23
Filing date: 2004-12-23
Publication date: 2009-01-07
Anticipated expiration: 2024-12-23
Also published as: CN1798415A

Abstract

The present invention discloses a method for testing virtual access of a random access channel in a WCDMA system. The method firstly appoints signatures and sub-channel numbers to be some fixed values when user equipment (UE) initiates an access request, then make a base station carry out capture on all of the configured sub-channels and reports all system frame numbers (SFN), time slot numbers (Slot) and available signatures in the associated information of access signals with signal-to-noise ratio higher than an access capture threshold to a maintenance station of the base station for preservation. The maintenance station of the base station obtains corresponding sub-channel numbers according to the SFN and the Slot of the reported access signals and then judges whether the available signatures and the available sub-channel numbers of the access signals respectively coincide to the available signatures and the available sub-channel numbers when the UE initiates the access request, if true, then is UE access, else is virtual access. Then, the probability of the virtual access can be calculated by a judgment result, and the problem of testing the virtual access under the condition that services operate in the WCDMA system are solved.

Description

The method of testing that the Random Access Channel virtual connection is gone in a kind of WCDMA system

Technical field

The present invention relates to wide code and divide multiple access (WCDMA) technology, be meant the method for testing that the Random Access Channel virtual connection is gone in a kind of WCDMA system especially.

Background technology

WCDMA is a kind of of three kinds of mainstream standard of 3G (Third Generation) Moblie (3G), it has not only inherited the high and open good characteristics of existing global system for mobile communications (GSM) standardization level, and have and GSM network favorable compatibility and interoperability, be one of development trend of future mobile communications.

The transmission channel of WCDMA is divided into Common transport channel and dedicated transmission channel two big classes.Wherein, Common transport channel mainly comprises Broadcast Control Channel (BCCH), forward access channel (FACH), paging channel (PCH) and Random Access Channel (RACH) etc.Wherein BCCH is used for subscriber equipment in full sub-district provides the broadcast message that relation is unified cell configuration; RACH is used for base station (B node or NodeB) to WCDMA and sends control information or business datum from user's equipment (UE), and RACH also can be used for sending short user grouping bag, and the WCDMA base station receives the signal of RACH all the time in full sub-district.All above transmission channels all are mapped to physical channel, and different physical channels is distinguished with different spreading codes, and wherein the physical channel of RACH mapping is Physical Random Access Channel (PRACH).

Because the common signal channel characteristic of PRACH in the WCDMA network, all service request from user, position renewal etc. all are to initiate at PRACH, and in some cases, also are used to send short user grouping bag.And along with the network user's increase, the last load of PRACH the situation of PRACH demodulation resource anxiety will occur with increasing.In addition, the virtual connection that often exists a variety of causes to cause on the PRACH is gone into, so-called virtual connection is gone into, determine by signal detection scheme, it is meant that the base station is when catching the wireless frequency expansion signal, signal to noise ratio and an artificial thresholding of setting of signal specific are compared, when the signal to noise ratio of this signal is higher than this thresholding, think that then this signal exists, otherwise think and do not exist, like this under the lower situation of threshold setting, although do not comprise certain signal specific in the signal that receives, also often be taken as signal specific, and this is virtual connection and goes into for the wireless access request of WCDMA.These virtual connections are gone into undoubtedly can consume certain demodulation resource, will make the situation of PRACH resource anxiety aggravate.Former thereby make PRACH resource anxiety by traffic carrying capacity, can solve by rational network design and planning; And go into for the virtual connection in the network, can only solve by improving the mode that inserts detection threshold.Insert the influence that detection threshold can cause two aspects to the performance of network yet improve: on the one hand, improve the access detection threshold and dwindled the sub-district covering; On the other hand, improve the access detection threshold and make UE could insert, increased interference with bigger power emission signal.But improve the access detection threshold is again to solve unique way that problem is gone in virtual connection, therefore inserts the quality that whether rationally is directly connected to network performance of detection threshold setting.Yet rational access detection threshold is set, just must at first goes into accurately to measure the virtual connection of PRACH.

Having stipulated among the agreement 3GPP 25.141 does not have under the service operation situation in the laboratory and when test, the method of measurement that virtual connection is gone into, promptly when no UE initiates to insert request, all accesses that observe in base station side all are that (be used to catch the base station computing that these virtual connections go into and go into computing virtual connection) gone in virtual connection, the probability of going in base station side statistics virtual connection indegree and Time Calculation virtual connection then, promptly the number of times that virtual connection is gone in the unit interval carries out the percentage that virtual connection goes into to catch the total degree of computing with interior base station of unit interval.At present in real network, especially when service operation is arranged, generally can directly not carry out virtual connection goes into relevant test, and when the access detection threshold is set, the way of taking generally is directly to be used in the test result that draws in the breadboard ecotopia, the result of She Zhiing generally can be on the low side like this, so consider that sometimes actual environment is more complicated, can suitably improve.Yet there are very big difference in laboratory environment and real network, because this greatest differences, the real conditions that measurement result can not reflect conscientiously that virtual connection is gone into when in the real network service operation being arranged is gone in the feasible virtual connection that draws according to the method for above-mentioned agreement regulation, and then causes inserting inaccurate that detection threshold is provided with.

Summary of the invention

In view of this, the object of the present invention is to provide the method for testing that the Random Access Channel virtual connection is gone in a kind of WCDMA system, solving in the real network has the test problem that virtual connection is gone under the service operation situation.

In order to achieve the above object, the invention provides the method for testing that the Random Access Channel virtual connection is gone in a kind of WCDMA system, this method comprises:

A, subscriber equipment (UE) available signatures and the available subchannels during according to predefined access request number initiates to insert request;

B, base station insert signal at the predefined available signatures and the available subchannels number set IT that insert signal of catching, and signal to noise ratio is higher than the information of the access signal of default access detection threshold value in the record access signal of catching;

C, from the information of access signal of record, obtain signature and Sub-Channel Number, and signature and Sub-Channel Number that whether the signature of judging this access signal uses when initiating to insert with UE respectively with Sub-Channel Number are consistent, if, it then is the access of UE, otherwise, calculate the probability that virtual connection is gone into according to judged result then for virtual connection is gone into.

In said method, the present invention further comprises: before test, available signatures when configurating base station is caught the set of the available signatures that inserts signal and available subchannels number and UE and initiated to insert request and available subchannels number, and available signatures and the available subchannels of described UE when initiating to insert request number is contained in respectively in the available signatures and the set of available subchannels number of base station when catching.

In said method, the available signatures when described UE initiates to insert request be in all available signatures of base station any one or a plurality of, and the subchannel of described configuration also in all available subchannels of base station of configuration any one or a plurality of.

In said method, the set that described configurating base station is caught the available signatures that inserts signal and available subchannels number is: in Random Access Channel information (PRACH Info) table in radio network controller (RNC) maintenance console this set is set, and this table is sent to base station and UE; Signature and Sub-Channel Number when described configuration UE is initiated to insert request are: the access service classification in the RNC maintenance console is provided with available signatures and the available subchannels number when the base station initiates to insert request of configuration UE in (ASC Setting) table.

In said method, among the step c, the described step of obtaining signature and Sub-Channel Number comprises: the base station reports the base station maintenance platform with the System Frame Number in the recorded information (SFN), signature (Signature) and timeslot number (Slot), the base station maintenance platform obtains corresponding Sub-Channel Number according to the SFN and the Slot of the access signal that reports.

In said method, among the described step c, the step that probability is gone in the calculating virtual connection comprises: calculate in the access signal message of record, signature except that signature and Sub-Channel Number during respectively with the UE access the set signal identical with Sub-Channel Number, the percentage that virtual connection goes into to catch the total degree of computing is carried out in the number of other signal and base station.

In said method, described step b further comprises, the base station maintenance platform is kept at SFN, Signature and the Slot of the access signal that the base station reports in the length of testing speech of setting;

The total degree that computing is caught in the access that carry out the base station among the described step c goes into to catch the total degree of computing for the virtual connection that carry out the base station in the length of testing speech of the described setting of step b.

In sum, signature when the present invention at first makes subscriber equipment (UE) initiate to insert request and Sub-Channel Number are certain fixed value, make the base station on the signature of all configurations and subchannel, catch then, and will insert System Frame Number in the relevant information of signal, timeslot number and signature report the base station maintenance platform and preserve, the base station maintenance platform is according to the SFN and the Slot of the access signal that reports, obtain corresponding Sub-Channel Number, available signatures when whether the available signatures of judging this access signal then and available subchannels number are initiated to insert with UE respectively and available subchannels are number consistent, if, it then is the access of UE, otherwise for virtual connection is gone into, calculate the probability that virtual connection is gone into according to judged result then, the system that solved has the virtual connection under the service operation situation to go into test problem.

Description of drawings

Fig. 1 is a method flow diagram of the present invention.

Embodiment

For making the purpose, technical solutions and advantages of the present invention clearer, the present invention is described in further detail below in conjunction with accompanying drawing.

Before test, set in advance base station default access detection threshold value; Catch the available signatures (Available Signature) of access signal and the set of available subchannels number (Available Sub-channel) in the base station that radio network controller (RNC) maintenance console is provided with in PRACH information (PRACH info) table (table 1) then, for example in table 1, available signatures set when catch the base station that is provided with and available subchannels number set are respectively: (these two values are 16 system numbers for 0xFFFF and 0xEEF, use its value by bit, the former 16 bits are 1 entirely, in 12 bits of the latter, except that the 5th and 9 bits are 0, all the other 10 bits are 1 entirely);

Information Element/Group name	The value of setting	Parameter is provided with explanation
Information Element/Group name	The value of setting	Parameter is provided with explanation	CHOICE mode
＞FDD		The pattern of indication WCDMA	CHOICE mode
＞FDD		The pattern of indication WCDMA	＞＞Available Signature	0xFFFF	The all signature of indication NodeB demodulation generally also are made as 0xFFFF in the real network
＞＞Available Sub Channel Number	0xEEF	Indication NodeB can demodulation Subchannel constantly, generally be made as 0xFFF in the real network	＞＞Available Signature	0xFFFF

Table 1

Then be provided with in (ASC Setting) table (table 2) in the access service classification, available signatures and the available subchannels number of configuration UE when request initiate to be inserted in the base station, in at table 2, the two is 0x1 (this value is 16 system numbers), available signatures set when UE initiates access herein is by the initial index that available signatures is set and finishes index and realize that initial index and end index are 0x1.By above configuration, can so that the base station available signatures set for 0～15}, available subchannels number set is { 0,1,2,3,5,6,7,9,10, catch on the 11}, and UE is when initiate inserting, can only use 1 this value in the above-mentioned signature set and Sub-Channel Number the 1st subchannel in gathering.

Information Element/Group name	The value of setting	Parameter is provided with explanation
Information Element/Group name	The value of setting	Parameter is provided with explanation	CHOICE mode
＞FDD		The pattern of indication WCDMA	CHOICE mode
＞FDD		The pattern of indication WCDMA	＞＞Available signature Start Index	0x1	Indication UE initiates to insert the initial index of available signature, generally is made as 0 in the real network
＞＞Available signature End Index	0x1	Indication UE initiates to insert the end index of available signature, generally is made as 0xF in the real network	＞＞Available signature Start Index	0x1
＞＞Available signature End Index	0x1		＞＞Assigned Sub-Channel Number	0x1	Distribute to this ASC subchannel number, 0xF

Table 2

Certainly, the signature when configuration UE initiate to insert request can select for use in all available signatures of base station any one or a plurality of, the Sub-Channel Number when configuration UE is initiated to insert request also can in all available subchannels of base station of configuration any one or a plurality of.But the set that must guarantee the set of the available signatures when UE initiate to insert request and available subchannels number is respectively the subclass that the corresponding set when inserting signal is caught in the base station.

By PRACH info and ASC Setting information table are set at the RNC maintenance console, can be so that signature and the Sub-Channel Number of UE when initiate inserting request be set point in the table, like this, only need to judge that at the base station maintenance platform whether the signature that inserts signal and Sub-Channel Number be that just can which to be distinguished from all access signals of catching be that virtual connection is gone into to PRACH info respective settings value, and which is user's actual access, thereby calculates the probability that virtual connection is gone into.

Method flow of the present invention specifically comprises the steps: as shown in Figure 1

Step 101:UE initiates to insert request according to the signature and the subchannel of configuration to the base station.

Step 102: catch on the signature of all configurations and subchannel the base station, and writing down the information that signal to noise ratio wherein is higher than the signal of default access detection threshold value, the System Frame Number (SFN), signature (Signature) and the timeslot number (Slot) that respectively insert signal then in the information with record report the base station maintenance platform.

Step 103: the base station maintenance platform is preserved and is set the access signal message that the base station reports in the duration.

Step 104: analyze the access signal message that the base station maintenance console is preserved, promptly at first draw corresponding Sub-Channel Number according to SFN and Slot in the access signal message of base station maintenance platform preservation, signature and Sub-Channel Number when whether the available signatures of judging this access signal then and available subchannels number are initiated to insert with UE respectively are consistent, if, it then is the access of UE, otherwise, calculate the probability that virtual connection is gone into according to judged result then for virtual connection is gone into.

Specifically how drawing corresponding separately Sub-Channel Number according to SFN and Slot can be referring to table 3, and the SFN that inserts signal as certain is 3, and Slot is 11, and the Sub-Channel Number that then shows this access signal is 2.

Table 3: the up link access slot of different RACH subchannels

(The available uplink access slots for different RACH sub-channels)

In addition, the virtual connection of carrying out in setting duration is gone into to catch the computational methods of the total degree of computing and is:

Now illustrate as follows: it is 20s that duration is set in order, and 1 to insert frame length be 20ms, totally 24 subchannels, and the available subchannels number of catching according to the base station of above-mentioned setting is 10, then the number of subchannels that can catch in the time at 20ms is 20; The available signatures number of configuration is 16, and available signatures and the available subchannels number average of UE when initiate inserting is 1, so the number of subchannels that the system acquisition virtual connection is gone into is 10-1=9, carries out the subchannel that virtual connection goes into to catch in the time at 20ms and adds up to

System once catches computing at each time slot at each available signatures, and each time slot has and catches computing 16 times like this, can obtain the number of times that average each subchannel catches computing according to the corresponding relation of the time slot of table 3 and subchannel to be

8 for form has 8 row, and 5 expressions, 5 row have a time slot corresponding, therefore draw according to above-mentioned formula: system carries out virtual connection and goes into to catch the total degree of computing and be:

The calculating virtual connection is gone into probability method and is described as follows: delete available signatures and available subchannels number identical part when wherein signature is all asked with the UE initiation access of configuration with Sub-Channel Number, the virtual connection that carry out in setting duration the number of calculating residual signal and base station goes into to catch the percentage of the total degree of computing, is the probability that virtual connection is gone into.

In a word, the above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.

Claims

1, the method for testing that the Random Access Channel virtual connection is gone in a kind of WCDMA system, it is characterized in that: the method comprising the steps of:

A, subscriber equipment available signatures and the available subchannels during according to predefined access request number initiates to insert request;

C, from the information of access signal of record, obtain signature and Sub-Channel Number, and signature and Sub-Channel Number that whether the signature of judging this access signal uses when initiating to insert with subscriber equipment respectively with Sub-Channel Number are consistent, if, it then is the access of subscriber equipment, otherwise, calculate the probability that virtual connection is gone into according to judged result then for virtual connection is gone into.

2, the method for testing that the Random Access Channel virtual connection is gone in the WCDMA according to claim 1 system, it is characterized in that: the present invention further comprises: before test, configurating base station is caught the set of the available signatures that inserts signal and available subchannels number and subscriber equipment available signatures and the available subchannels number when initiating to insert request, and available signatures and the available subchannels of described subscriber equipment when initiating to insert request number is contained in respectively in the available signatures and the set of available subchannels number of base station when catching.

3, the method for testing that the Random Access Channel virtual connection is gone in the WCDMA according to claim 2 system, it is characterized in that: the available signatures when described subscriber equipment initiates to insert request be in all available signatures of base station any one or a plurality of, and the subchannel of described configuration also in all available subchannels of base station of configuration any one or a plurality of.

4, the method for testing that the Random Access Channel virtual connection is gone in the WCDMA according to claim 2 system, it is characterized in that: the set that described configurating base station is caught the available signatures that inserts signal and available subchannels number is: in the Random Access Channel information table in the radio network controller maintenance console this set is set, and this table is sent to base station and subscriber equipment; Signature and Sub-Channel Number when described configure user equipment initiates to insert request are: the access service classification in the radio network controller maintenance console is provided with available signatures and the available subchannels number when the base station initiates to insert request of configure user equipment in the table.

5, the method for testing that the Random Access Channel virtual connection is gone in the WCDMA according to claim 1 system, it is characterized in that: among the step c, the described step of obtaining signature and Sub-Channel Number comprises: the base station reports the base station maintenance platform with the System Frame Number in the recorded information, signature and timeslot number, the base station maintenance platform obtains corresponding Sub-Channel Number according to the System Frame Number and the timeslot number of the access signal that reports.

6, the method for testing that the Random Access Channel virtual connection is gone in the WCDMA according to claim 1 system, it is characterized in that: among the described step c, the step that probability is gone in the calculating virtual connection comprises: calculate in the access signal message of record, signature except that signature and Sub-Channel Number during respectively with the subscriber equipment access the set signal identical with Sub-Channel Number, the percentage that virtual connection goes into to catch the total degree of computing is carried out in the number of other signal and base station.

7, the method for testing that the Random Access Channel virtual connection is gone in the WCDMA according to claim 6 system, it is characterized in that: described step b further comprises, the base station maintenance platform is kept at System Frame Number, signature and the timeslot number of the access signal that the base station reports in the length of testing speech of setting;